<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div>
        <!-- 登录状态下,登出页面显示 -->
        <div v-if="isLogin">
            <input type="text" v-model="newName">
            <input type="button" value="添加" @click="arr.push(newName)">
            <a href="javascript:void(0)" @click="isLogin=false">登出</a>
        </div>
        <!-- 未登录状态下,登录页面显示 -->
        <div v-else>
            <!-- 如果超链接点击时,不跳转需要添加javascript:void(0)
                 跳转功能作废 -->
            <a href="javascript:void(0)">注册</a>
            <a href="javascript:void(0)" @click="isLogin=true">登录</a>
        </div>

        <ul>
            <li v-for="name in arr">{{name}}</li>
        </ul>
    </div>
    <script src="../js/vue.js"></script>
    <script>
        let v = new Vue ({
            el : "body>div",
            data : {
                arr : ["刘备","关羽"],
                isLogin : false,
                newName : ""
            }
        })
    </script>
</body>
</html>